Valentines Day: What to buy for the gal I'm currently allowing to pleasure my penis ?

I already have a reservation booked at a luxurious Beachfront Seafood & Steak restaurant... Please help me with other ancillary gift ideas so that I may coax this fine lady into a Menage-a-Trois with her attractive college friend (to be determined at a future date).. God Bless & Thank you in advance